JPH04245569A - Document file retrieving method - Google Patents

Abstract

PURPOSE:To execute retrieving processing at high speed by executing the rewriting of retrieving information with a rewritable optical disk. CONSTITUTION:A document information area 11 to store the storage area of a rewritable optical disk every a respective document, a document control information area 12 to store the control information of the document every the respective document and a retrieving information area 13 to store retrieving information prepared by the document control information are provided. The control information of the document is written in the document control information area 12 at the time of writing the document in the document information area 11 newly, the retrieving information is rewritten by the control information of the document and the retrieving of the document is executed with the retrieving information.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for searching document files on a rewritable optical disc.

0002

[Prior Art] Optical disks have become widely used because they have a large storage capacity and access speed is much faster than magnetic tape, and their storage capacity per unit area is several tens of times larger than IC memory. Ta. There are three types of optical disks: a read-only type, a write-once type that allows writing only once, and a rewritable type that allows writing, such as a compact disk (CD). CDs have been put to practical use for digital audio, and LDs (Laser Disks) have been put into practical use for moving images, and both have become quite popular. The read-only type has been put into practical use as a business-use file, that is, a computer file, and is becoming widespread. The rewritable type, which can be rewritten any number of times, is still in the development stage, and full-scale practical use is yet to come due to reliability and durability issues.

[0003] Because of this situation, many methods of searching for documents recorded on optical discs are aimed at the write-once type, in which documents can be written only once. An example of the contents of the storage area of the optical disc used in such a search method will be explained using FIG. 6. FIG. 6 shows how the optical disc storage area is used. There is a document information area 61 consisting of a group of document information that stores documents one by one, and a document information area 61 that stores document information for each document. A document management information area 62 consisting of a set of document management information provided, and index information for creating index information for searching documents from the document management information of these documents and writing this index information when a predetermined number of documents are stored. It is composed of a region 63.

[0004] The case of searching for a document or storing a new document using such document management information and index information will be explained. First, when searching for a desired document, index information regarding the latest document is read into an auxiliary storage device such as a floppy disk or hard disk. However, if there are documents that have been written since the index information for this latest document was created, the document management information for these documents will also be read and
Index information that includes all documents currently stored on the optical disk is created from this information, and a desired document is searched from this index information.

Furthermore, when storing a new document on the optical disk, this new document is stored in the document information area 61 as document information #N+1, and the management information of this document is stored as document management information #N+1a. At this time, if this new document is exactly the predetermined number of documents (for example, 1000th document) since the index information for documents #1 to #ML was previously created, the index information for documents #1 to #ML and the document management Load information #N+1a into the auxiliary storage device,
Index information regarding new documents #1 to #ML+1 is created and written in the index information area 63. Subsequent searches are performed using the index information regarding documents #1 to #ML+1. Furthermore, when the predetermined number is not reached, no processing is performed on the index information area 63.

[0006]

As described above, when storing a new document, when this number reaches a predetermined number, new index information is created in the index information area 63 and this information is added. Therefore, it is necessary to secure the index information area 63 in advance by predicting how much additional information will be added, and the document information area 63 must be reserved accordingly.
1's memory capacity was decreasing. Furthermore, if the predicted area is insufficient, a situation may occur in which the index information area 63 becomes saturated first, making it impossible to write index information even though the document information area 61 is empty. Furthermore, when storing documents close to the above-mentioned predetermined number and retrieving them, document management information of close to the predetermined number is read into the auxiliary storage device and index information is created, which takes a lot of time.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a document file search method that performs high-speed search processing by rewriting index information using a rewritable optical disk. do.

[0008]

[Means for Solving the Problems] In order to achieve the above object, the document file search method of the present invention includes a document information area for storing each document in a storage area of a rewritable optical disk, and a document information area for storing each document's management information. A document management information area is provided for storing each document, and a search information area is created from this document management information and stores search information for searching the document. When writing a new document to the document information area, this document writing management information in the document management information area, and
The search information is rewritten using this document management information, so that when searching for a desired document, the search information is searched.

[0009]

[Operation] With the above configuration, the search information is rewritten every time a document is stored, and all stored documents can be searched at all times, so this search information can be used to perform document searches at high speed. can.

0010

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows the configuration of an optical disc storage area in an embodiment of the present invention. In this figure, the document information area 11 and document management information area 12 are the same as in FIG. 6, but the index information area 13 stores only index information regarding all registered documents, and this content is rewritten each time a new document is stored. .

FIG. 2 is a diagram showing the configuration of a search system that implements this embodiment. In the figure, 1 is an optical disk control device containing an optical disk, 2 is a document input/output device equipped with a reading section, a recording section, and a display section for inputting and outputting document files, and 3 is an optical disk control device for searching document files. A search device that stores index information; 4 indicates each of these devices 1 to 3;
This is a system control device that controls the

FIG. 3 is a block diagram of the detection device 3. In the figure, numeral 31 denotes a system interface section, which interfaces with the system control section 4. 32 is a search control unit that loads index information input through the system interface unit 31 into the main memory 33 and performs index processing.

FIG. 4 shows the contents of each piece of document management information #Ka stored in the document management information area 12 of FIG. It includes a document number DNi indicating the number of each document file, document position information ADi indicating the position of each document file, and keywords KWi,1 to KWi,n assigned to each document file.

FIG. 5 shows an example of index information regarding all registered documents stored in the index information area 13 of FIG. Keyword KW1 of the document file and document number list DN1,1 to DN1,m of the document file having the keyword KW1
1, and K index cells from index cell 2 to index cell K, which are similar, are sorted in descending order of keywords. Using this index information, the document number DNi of the document file having the specified keyword can be searched at high speed.

Next, the operation will be explained. In FIG. 2, when an optical disc is first set in the optical disc controller 1, the system controller 4 controls the optical disc controller 1 to read index information from the index information area 13 shown in FIG. Send to. The search control unit 32 in the search device 3 is a system interface unit 31
The index information received is loaded into the main memory 33. The index information loaded into the main memory 33 corresponds to all the document information stored on the optical disk, and based on this index information,
Search processing using the keywords shown in 5 is performed.

When registering document information, the system control device 4 adds new document information input from the document input/output device 2 to the document management information area 12 shown in FIG. 1 of the optical disc. Thereafter, this document management information is sent to the search device 3. In the search device 3, the system interface section 31 receives the sent document management information, and stores the keywords and document numbers included in the document management information in the diagram on the main memory 33 via the search control section 32. The index information is additionally inserted at the predetermined position shown in 5. Furthermore, the index control unit 32 transmits the latest index information in which the keyword added to the newly registered document information is inserted from the main memory 33 to the system control device 4 via the system interface unit 31,
The index information recorded in the index information area 13 of the optical disc set in the optical disc control device 1 is rewritten.

[0017]

As is clear from the above description, the present invention uses the index information area on a rewritable optical disc as a rewritable index information area, thereby converting the index information area into a small constant area and converting it into a document information area. By securing as large as possible and rewriting the index information of all documents including the index data of the document information each time new document information is registered, high-speed search processing is possible.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of an optical disk storage area used in an embodiment of the present invention.

[Figure 2] Configuration diagram of a search system that implements this embodiment

[Figure 3] Configuration diagram of search device

[Figure 4] Diagram showing the contents of the document management information shown in Figure 1

[Figure 5
] A diagram showing the contents of index information regarding all registered documents shown in Figure 1.

[Figure 6] Diagram showing the configuration of a conventional optical disc storage area

[Explanation of symbols]

1 Optical disc control device 2 Document input/output device 3 Search device 4 System control device 11 Document information area 12 Document management information area 13 Index information area 31 System interface section 32 Search control section 33 Main memory

Claims (1)

[Claims] Claim 1: A document information area for storing a storage area of a rewritable optical disk for each document; a document management information area for storing management information of this document for each document; A search information area is provided to store search information for searching a document, and when a new document is written in the document information area, the management information of this document is written in the document management information area, and the management information of this document is A document file search method characterized in that the search information is rewritten and the search information is searched when searching for a desired document.